基于单片机的电压表的设计.doc

本科毕业设计论文 题 目系 别 专 业 班 级 学生姓名 指导教师 2012年 ABSTRACT The birth of digital voltage meter break the traditional model of electronic measuring instruments and patterns. It shows the clear and intuitive, accurate readings, using an advanced digital display technology, greatly reduced due to human factors of the measurement error caused by the incident. Digital voltage meter is a row of analog (DC input voltage) into a non-continuous, discrete digital form, and the instrument display. Digital voltage meter to electronic technology, computing technology, automation technology and precision of the results of electrical measurement technology closer together and become instruments, meters and complete an independent field of a branch, digital voltage meter indicates that the field of electronic devices a revolution and also pioneered the modern pioneer of electronic measurement technology. The design uses a single-chip platform for the development, control of the Department of the use of AT89C52 single-chip, A/D conversion using ADC0809. In addition to the realization of the system to ensure that the required functionality, but also facilitate the 8 other A/D converter measurement, distance measurement function of transmission expansion. Simple digital voltage measuring circuit is made of the A/D conversion, data processing, display control, etc. KEY WORDS: SCM; C8051F020; A/D conversion; data processing; LCD 目 录 第1章 前 言 1 1.1设计的背景及意义 1 1.2发展历史及研究现状 1 1.3设计所做的工作 2 1.4论文进度安排 2 第2章 方案设计 3 2.1方案选择 3 2.1.1单片机的选型 3 2.1.2量程转换方案设计 4 2.1.3显示部分方案设计 4 2.2方案论证 4 第3章 硬件设计 5 3.1输入电路设计 5 3.1.1量程切换检测电路设计 5 3.1.2衰减电路： 5 3.2单片机控制模块设计 6 3.2.1单片机主控电路 6 3.2.2芯片C8051F020介绍 7 3.2.3时钟电路 10 3.2.4复位电路 11 3.3量程转换模块设计 11 3.3.1电路选择 11 3.3.2工作原理及换算关系 12 3.4次逼近式A/D转换模块设计 12 3.4.1模数转换器 12 3.4.2模数转换器 13 3.4.3A/D转换电路设计 13 3.5显示模块设计 14 3.5.1LCD显示模块 14 3.5.2LCD1602的引脚功能 15 3.5.3LCD1602的显示操作 15 第4章 系统软件设计 21 4.1主程序设计 21 4.2A/D转换程序 22 4.3中断服务程序 22 第5章 系统仿真与调试 2